杜甫被称为诗什么>蹴罢秋千专利名称:Self-tapping screw 发明人:Siegfried Schule
申请号:US07/021277
申请日:19870303黑色用英语怎么写
公开号:US04778319A框框里面打勾的符号
公开日:
黄氏响声丸说明书
查mac地址
19881018
信号差专利内容由知识产权出版社提供
摘要:A lf-tapping screw (1) for u in fixing insulating boards (4) and waterproof sheeting (3, 3'), to a flat roof sheet panel (2), has a screw head (6), a lf-drilling tip (10) and a screw shank which has a lf- tapping thread (9) adjoining the lf-drilling tip (10) and divided into ctions (9/2, 9/3) by at least one smooth shank ction (8). A further smooth shank ction (7) directly adjoins the screw head (6). The diameter of the smooth shank ctions (7, 8) is smaller than the root diameter of the lf-tapping thread (9), and the end (15) of each thread ction nearest the screw head (6), extends radially inwardly to the screw-shank diameter in the form of a flat radial surface (16) which is free of a thread run-out and is perpendicular to the axis of the screw shank. The screw (1) provides greater reliability against being unintentionally slackened, relead and pulled out of its anchorage hole under the typical stress experienced by flat roofs.
申请人:SCHULE; SIEGFRIED
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